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Impact of injection conditions on flame characteristics from a parallel multi-jet burner

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  • Mi, Jianchun
  • Li, Pengfei
  • Zheng, Chuguang

Abstract

This numerical study systematically investigates the influence of initial injection conditions of reactants on flame characteristics from a parallel multi-jet burner in a laboratory-scale furnace. In particular, varying characteristics from visible flame to invisible Moderate or Intense Low-oxygen Dilution (MILD) combustion is explored. Different parameters examined include the initial separation of fuel and air streams (S), air nozzle diameter (Da), fuel nozzle diameter (Df), and air preheat temperature (Ta). The present simulations agree qualitatively well with previous measurements reported elsewhere for two reference cases investigated by experiment. A number of new and significant findings are then deduced from the simulations. For instance, all S, Da and Df are found to play significant roles in achieving a proper confluence location of air and fuel jets for establishing the MILD combustion. Particularly, varying Da is most effective for controlling the combustion characteristics. It is also found that the stability limits of the non-premixed MILD combustion varies with different combustor systems and inlet reactant properties. Moreover, for the first time, several analytical approximations are obtained that relate the flue-gas recirculation rate and the fuel-jet penetration to Da, Df, S and also reactant properties.

Suggested Citation

  • Mi, Jianchun & Li, Pengfei & Zheng, Chuguang, 2011. "Impact of injection conditions on flame characteristics from a parallel multi-jet burner," Energy, Elsevier, vol. 36(11), pages 6583-6595.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:11:p:6583-6595
    DOI: 10.1016/j.energy.2011.09.003
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    References listed on IDEAS

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    1. Schaffel-Mancini, Natalia & Mancini, Marco & Szlek, Andrzej & Weber, Roman, 2010. "Novel conceptual design of a supercritical pulverized coal boiler utilizing high temperature air combustion (HTAC) technology," Energy, Elsevier, vol. 35(7), pages 2752-2760.
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    1. Cheong, Kin-Pang & Wang, Guochang & Si, Jicang & Mi, Jianchun, 2021. "Nonpremixed MILD combustion in a laboratory-scale cylindrical furnace: Occurrence and identification," Energy, Elsevier, vol. 216(C).
    2. de Azevedo, Cláudia Gonçalves & de Andrade, José Carlos & de Souza Costa, Fernando, 2015. "Flameless compact combustion system for burning hydrous ethanol," Energy, Elsevier, vol. 89(C), pages 158-167.
    3. Cheong, Kin-Pang & Wang, Guochang & Wang, Bo & Zhu, Rong & Ren, Wei & Mi, Jianchun, 2019. "Stability and emission characteristics of nonpremixed MILD combustion from a parallel-jet burner in a cylindrical furnace," Energy, Elsevier, vol. 170(C), pages 1181-1190.
    4. Kuang, Yucheng & He, Boshu & Wang, Chaojun & Tong, Wenxiao & He, Di, 2021. "Numerical analyses of MILD and conventional combustions with the Eddy Dissipation Concept (EDC)," Energy, Elsevier, vol. 237(C).
    5. Zhao, Zhenghong & Zhang, Zewu & Zha, Xiaojian & Gao, Ge & Li, Xiaoshan & Wu, Fan & Luo, Cong & Zhang, Liqi, 2023. "Internal association between combustion behavior and NOx emissions of pulverized coal MILD-oxy combustion affected by adding H2O," Energy, Elsevier, vol. 263(PD).
    6. Wang, Feifei & Li, Pengfei & Mei, Zhenfeng & Zhang, Jianpeng & Mi, Jianchun, 2014. "Combustion of CH4/O2/N2 in a well stirred reactor," Energy, Elsevier, vol. 72(C), pages 242-253.
    7. Wang, G. & Si, J. & Xu, M. & Mi, J., 2019. "MILD combustion versus conventional bluff-body flame of a premixed CH4/air jet in hot coflow," Energy, Elsevier, vol. 187(C).
    8. Gao, Xuan & Duan, Fei & Lim, Seng Chuan & Yip, Mee Sin, 2013. "NOx formation in hydrogen–methane turbulent diffusion flame under the moderate or intense low-oxygen dilution conditions," Energy, Elsevier, vol. 59(C), pages 559-569.
    9. Tian, Junjian & Liu, Xiang & Shi, Hao & Yao, Yurou & Ni, Zhanshi & Meng, Kengsheng & Hu, Peng & Lin, Qizhao, 2024. "Experimental study on MILD combustion of methane under non-preheated condition in a swirl combustion furnace," Applied Energy, Elsevier, vol. 363(C).
    10. Lawal, Mohammed S. & Fairweather, Michael & Gogolek, Peter & Ingham, Derek B. & Ma, Lin & Pourkashanian, Mohamed & Williams, Alan, 2013. "CFD predictions of wake-stabilised jet flames in a cross-flow," Energy, Elsevier, vol. 53(C), pages 259-269.

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